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output: add wlr_output_state_init()

Browse source 
This changes the semantics of wlr_output_state. Instead of having
fields with uninitialized memory when missing from the committed
bitflag, all fields are always initialized (and maybe NULL/empty),
just like we do in wlr_surface_state. This reduces the chances of
footguns when reading a field, and removes the need to check for
the committed bitfield everywhere.

A new wlr_output_state_init() function takes care of initializing
the Pixman region.
This commit is contained in:
Simon Ser 2023-06-22 15:48:35 +02:00 • committed by Alexander Orzechowski
parent 8a5b5e6f28
commit be05097968
19 changed files with 103 additions and 103 deletions
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9
types/output/output.c
View file

@ -319,15 +319,10 @@ static void handle_display_destroy(struct wl_listener *listener, void *data) {
wlr_output_destroy_global(output);
}
static void output_state_init(struct wlr_output_state *state) {
memset(state, 0, sizeof(*state));
pixman_region32_init(&state->damage);
}
static void output_state_move(struct wlr_output_state *dst,
struct wlr_output_state *src) {
*dst = *src;
output_state_init(src);
wlr_output_state_init(src);
}
void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
@ -359,7 +354,7 @@ void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
wl_signal_init(&output->events.description);
wl_signal_init(&output->events.request_state);
wl_signal_init(&output->events.destroy);
output_state_init(&output->pending);
wlr_output_state_init(&output->pending);
output->software_cursor_locks = env_parse_bool("WLR_NO_HARDWARE_CURSORS");
if (output->software_cursor_locks) {

63
types/output/state.c
View file

@ -3,20 +3,19 @@
#include <wlr/util/log.h>
#include "types/wlr_output.h"
void wlr_output_state_init(struct wlr_output_state *state) {
*state = (struct wlr_output_state){0};
pixman_region32_init(&state->damage);
}
void wlr_output_state_finish(struct wlr_output_state *state) {
if (state->committed & WLR_OUTPUT_STATE_BUFFER) {
wlr_buffer_unlock(state->buffer);
// struct wlr_buffer is ref'counted, so the pointer may remain valid after
// wlr_buffer_unlock(). Reset the field to NULL to ensure nobody mistakenly
// reads it after output_state_finish().
state->buffer = NULL;
}
if (state->committed & WLR_OUTPUT_STATE_DAMAGE) {
pixman_region32_fini(&state->damage);
}
if (state->committed & WLR_OUTPUT_STATE_GAMMA_LUT) {
free(state->gamma_lut);
}
wlr_buffer_unlock(state->buffer);
// struct wlr_buffer is ref'counted, so the pointer may remain valid after
// wlr_buffer_unlock(). Reset the field to NULL to ensure nobody mistakenly
// reads it after output_state_finish().
state->buffer = NULL;
pixman_region32_fini(&state->damage);
free(state->gamma_lut);
}
void wlr_output_state_set_enabled(struct wlr_output_state *state,
@ -75,23 +74,14 @@ void wlr_output_state_set_subpixel(struct wlr_output_state *state,
void wlr_output_state_set_buffer(struct wlr_output_state *state,
struct wlr_buffer *buffer) {
if (state->committed & WLR_OUTPUT_STATE_BUFFER) {
wlr_buffer_unlock(state->buffer);
}
state->committed |= WLR_OUTPUT_STATE_BUFFER;
wlr_buffer_unlock(state->buffer);
state->buffer = wlr_buffer_lock(buffer);
}
void wlr_output_state_set_damage(struct wlr_output_state *state,
const pixman_region32_t *damage) {
if (state->committed & WLR_OUTPUT_STATE_DAMAGE) {
pixman_region32_fini(&state->damage);
}
state->committed |= WLR_OUTPUT_STATE_DAMAGE;
pixman_region32_init(&state->damage);
pixman_region32_copy(&state->damage, damage);
}
@ -99,11 +89,7 @@ bool wlr_output_state_set_gamma_lut(struct wlr_output_state *state,
size_t ramp_size, const uint16_t *r, const uint16_t *g, const uint16_t *b) {
uint16_t *gamma_lut = NULL;
if (ramp_size > 0) {
if (state->committed & WLR_OUTPUT_STATE_GAMMA_LUT) {
gamma_lut = realloc(state->gamma_lut, 3 * ramp_size * sizeof(uint16_t));
} else {
gamma_lut = malloc(3 * ramp_size * sizeof(uint16_t));
}
gamma_lut = realloc(state->gamma_lut, 3 * ramp_size * sizeof(uint16_t));
if (gamma_lut == NULL) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return false;
@ -112,9 +98,7 @@ bool wlr_output_state_set_gamma_lut(struct wlr_output_state *state,
memcpy(gamma_lut + ramp_size, g, ramp_size * sizeof(uint16_t));
memcpy(gamma_lut + 2 * ramp_size, b, ramp_size * sizeof(uint16_t));
} else {
if (state->committed & WLR_OUTPUT_STATE_GAMMA_LUT) {
free(state->gamma_lut);
}
free(state->gamma_lut);
}
state->committed |= WLR_OUTPUT_STATE_GAMMA_LUT;
@ -136,6 +120,10 @@ bool wlr_output_state_copy(struct wlr_output_state *dst,
copy.committed &= ~(WLR_OUTPUT_STATE_BUFFER |
WLR_OUTPUT_STATE_DAMAGE |
WLR_OUTPUT_STATE_GAMMA_LUT);
copy.buffer = NULL;
pixman_region32_init(&copy.damage);
copy.gamma_lut = NULL;
copy.gamma_lut_size = 0;
if (src->committed & WLR_OUTPUT_STATE_BUFFER) {
wlr_output_state_set_buffer(&copy, src->buffer);
@ -146,21 +134,18 @@ bool wlr_output_state_copy(struct wlr_output_state *dst,
}
if (src->committed & WLR_OUTPUT_STATE_GAMMA_LUT) {
size_t gamma_buffer_size = 3 * src->gamma_lut_size * sizeof(uint16_t);
copy.gamma_lut = malloc(gamma_buffer_size);
if (!copy.gamma_lut) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
const uint16_t *r = src->gamma_lut;
const uint16_t *g = src->gamma_lut + src->gamma_lut_size;
const uint16_t *b = src->gamma_lut + 2 * src->gamma_lut_size;
if (!wlr_output_state_set_gamma_lut(&copy, src->gamma_lut_size, r, g, b)) {
goto err;
}
copy.committed |= WLR_OUTPUT_STATE_GAMMA_LUT;
memcpy(copy.gamma_lut, src->gamma_lut, gamma_buffer_size);
copy.gamma_lut_size = src->gamma_lut_size;
}
wlr_output_state_finish(dst);
*dst = copy;
return true;
err:
wlr_output_state_finish(&copy);
return false;

3
types/output/swapchain.c
View file

@ -65,8 +65,9 @@ static bool test_swapchain(struct wlr_output *output,
bool wlr_output_configure_primary_swapchain(struct wlr_output *output,
const struct wlr_output_state *state, struct wlr_swapchain **swapchain_ptr) {
const struct wlr_output_state empty_state = {0};
struct wlr_output_state empty_state;
if (state == NULL) {
wlr_output_state_init(&empty_state);
state = &empty_state;
}

25
types/scene/wlr_scene.c
View file

@ -1534,7 +1534,8 @@ static bool scene_buffer_can_consider_direct_scanout(struct wlr_scene_buffer *bu
static bool scene_buffer_try_direct_scanout(struct wlr_scene_buffer *buffer,
struct wlr_scene_output *scene_output, struct wlr_output_state *state) {
struct wlr_output_state pending = {0};
struct wlr_output_state pending;
wlr_output_state_init(&pending);
if (!wlr_output_state_copy(&pending, state)) {
return false;
}
@ -1564,19 +1565,23 @@ bool wlr_scene_output_commit(struct wlr_scene_output *scene_output) {
return true;
}
struct wlr_output_state state = {0};
bool ok = false;
struct wlr_output_state state;
wlr_output_state_init(&state);
if (!wlr_scene_output_build_state(scene_output, &state)) {
return false;
goto out;
}
bool success = wlr_output_commit_state(scene_output->output, &state);
ok = wlr_output_commit_state(scene_output->output, &state);
if (!ok) {
goto out;
}
wlr_damage_ring_rotate(&scene_output->damage_ring);
out:
wlr_output_state_finish(&state);
if (success) {
wlr_damage_ring_rotate(&scene_output->damage_ring);
}
return success;
return ok;
}
bool wlr_scene_output_build_state(struct wlr_scene_output *scene_output,